The element in period-3 which does not form an oxide.
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ArgonReason — Electronic configuration of argon is 2, 8, 8 and so it's octet is complete and is stable and it does not form oxide.
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The formula of the hydride of the halogen in period 3.
The formula of the sulphite of the element in period-3, group 1 [IA].
The bonding [i.e. electrovalent or covalent] of the oxide of the element in period-3 group 16 [VIA].
The character of the hydroxide of the element in period-3 group 13 [IIIA].